Minimal structure magnetostrictive stress and torque sensor
US5144846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1990 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | May 2, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A noncontacting method for sensing stress and torque based on the principle of magnetostriction comprises inducing a magnetic flux in a shaft (20) via such means as a single core/coil(58/60) placed close to the shaft (20) which detects torque by means of voltage or current changes in the coil (60). Another embodiment comprises two single core/coils (58/60 and 59/61) and signal processing circuitry which produces a signal minimally affected by material property inhomogeneities. An additional embodiment employs a plurality of sensors (66A/66B) strategically located around the shaft (20) to eliminate spurious signals which are due to bending stress and shaft misalignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.